聚苯胺纳/微米结构薄膜的制备及对pH传感的影响  

Preparations of Nano/Micro Structured Polyaniline Membranes for pH Sensing

作　　者：宋继霞[1,2] 韩冬雪[1] 李斐[1] 牛利[1] 

机构地区：[1]中国科学院长春应用化学研究所,电分析化学国家重点实验室,长春130022 [2]中国科学院研究生院,北京100049

出　　处：《高等学校化学学报》2010年第8期1688-1692,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20673109)资助

摘　　要：考察了溶液酸度对纳/微米结构聚苯胺生长的影响.在0.1mol/L硫酸、pH=4和pH=7的磷酸缓冲溶液及0.1mol/L氨水中,在冰冻条件下氧化聚合苯胺单体,在溶液中和浸入反应溶液的玻璃基底上分别得到一系列不同形貌的聚苯胺,如:纳米仙人球、微米席子、微米片、微米花、三维网络、微米树状物和微米枝等.各种形貌的形成机理归结为pH的影响和冰的晶体结构的模板作用.另外,浸入反应溶液的基底诱导作用和聚合物扩散受限生长导致基底上树状结构的形成.基底上原位沉积的薄膜直接用于对pH缓冲溶液的响应研究,pH范围宽(pH=3～9),反应灵敏.Effect of acidity on the growth of polyaniline nanostructures was investigated in various acidic media,such as 0.1 mol/L H2SO4,phosphate buffer solutions（PBS） at pH=4 and pH=7,and 0.1 mol/L ammonium hydroxide.PANI nanostructures,such as nanocactus,micromats,microflakes,microroses and interconnected three-dimensional networks,microdendrimers,microbranches,etc.,were synthesized using ammonium persulfate as oxidant under frozen condition in solution and on dipped substrates,respectively.A possible mechanism for forming those PANI nanostructures,ascribed to pH effect and the crystalline aniso-tropy of ice to direct growth,was proposed.In addition,induction of dipped substrates and diffusion-limited growth play key roles in forming dendritic morphology on them.Moreover,pH responses of those four nanostructured PANI membranes in-situ deposited on glass substrates were further examined in the range of pH=3—9,which resulted in a high sensitivity.

关 键 词：聚苯胺 纳/微米结构 酸度 原位沉积 pH传感 

分 类 号：O631.24[理学—高分子化学] O631.5[理学—化学]